1 // plugin.cc -- plugin manager for gold -*- C++ -*- 2 3 // Copyright (C) 2008-2016 Free Software Foundation, Inc. 4 // Written by Cary Coutant <ccoutant@google.com>. 5 6 // This file is part of gold. 7 8 // This program is free software; you can redistribute it and/or modify 9 // it under the terms of the GNU General Public License as published by 10 // the Free Software Foundation; either version 3 of the License, or 11 // (at your option) any later version. 12 13 // This program is distributed in the hope that it will be useful, 14 // but WITHOUT ANY WARRANTY; without even the implied warranty of 15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 // GNU General Public License for more details. 17 18 // You should have received a copy of the GNU General Public License 19 // along with this program; if not, write to the Free Software 20 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 21 // MA 02110-1301, USA. 22 23 #include "gold.h" 24 25 #include <cstdio> 26 #include <cstdarg> 27 #include <cstring> 28 #include <string> 29 #include <vector> 30 31 #ifdef ENABLE_PLUGINS 32 #ifdef HAVE_DLFCN_H 33 #include <dlfcn.h> 34 #elif defined (HAVE_WINDOWS_H) 35 #include <windows.h> 36 #else 37 #error Unknown how to handle dynamic-load-libraries. 38 #endif 39 40 #if !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H) 41 42 #define RTLD_NOW 0 /* Dummy value. */ 43 static void * 44 dlopen(const char *file, int mode ATTRIBUTE_UNUSED) 45 { 46 return LoadLibrary(file); 47 } 48 49 static void * 50 dlsym(void *handle, const char *name) 51 { 52 return reinterpret_cast<void *>( 53 GetProcAddress(static_cast<HMODULE>(handle),name)); 54 } 55 56 static const char * 57 dlerror(void) 58 { 59 return "unable to load dll"; 60 } 61 62 #endif /* !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H) */ 63 #endif /* ENABLE_PLUGINS */ 64 65 #include "parameters.h" 66 #include "errors.h" 67 #include "fileread.h" 68 #include "layout.h" 69 #include "options.h" 70 #include "plugin.h" 71 #include "target.h" 72 #include "readsyms.h" 73 #include "symtab.h" 74 #include "descriptors.h" 75 #include "elfcpp.h" 76 77 namespace gold 78 { 79 80 #ifdef ENABLE_PLUGINS 81 82 // The linker's exported interfaces. 83 84 extern "C" 85 { 86 87 static enum ld_plugin_status 88 register_claim_file(ld_plugin_claim_file_handler handler); 89 90 static enum ld_plugin_status 91 register_all_symbols_read(ld_plugin_all_symbols_read_handler handler); 92 93 static enum ld_plugin_status 94 register_cleanup(ld_plugin_cleanup_handler handler); 95 96 static enum ld_plugin_status 97 add_symbols(void *handle, int nsyms, const struct ld_plugin_symbol *syms); 98 99 static enum ld_plugin_status 100 get_input_file(const void *handle, struct ld_plugin_input_file *file); 101 102 static enum ld_plugin_status 103 get_view(const void *handle, const void **viewp); 104 105 static enum ld_plugin_status 106 release_input_file(const void *handle); 107 108 static enum ld_plugin_status 109 get_symbols(const void *handle, int nsyms, struct ld_plugin_symbol *syms); 110 111 static enum ld_plugin_status 112 get_symbols_v2(const void *handle, int nsyms, struct ld_plugin_symbol *syms); 113 114 static enum ld_plugin_status 115 get_symbols_v3(const void *handle, int nsyms, struct ld_plugin_symbol *syms); 116 117 static enum ld_plugin_status 118 add_input_file(const char *pathname); 119 120 static enum ld_plugin_status 121 add_input_library(const char *pathname); 122 123 static enum ld_plugin_status 124 set_extra_library_path(const char *path); 125 126 static enum ld_plugin_status 127 message(int level, const char *format, ...); 128 129 static enum ld_plugin_status 130 get_input_section_count(const void* handle, unsigned int* count); 131 132 static enum ld_plugin_status 133 get_input_section_type(const struct ld_plugin_section section, 134 unsigned int* type); 135 136 static enum ld_plugin_status 137 get_input_section_name(const struct ld_plugin_section section, 138 char** section_name_ptr); 139 140 static enum ld_plugin_status 141 get_input_section_contents(const struct ld_plugin_section section, 142 const unsigned char** section_contents, 143 size_t* len); 144 145 static enum ld_plugin_status 146 update_section_order(const struct ld_plugin_section *section_list, 147 unsigned int num_sections); 148 149 static enum ld_plugin_status 150 allow_section_ordering(); 151 152 static enum ld_plugin_status 153 allow_unique_segment_for_sections(); 154 155 static enum ld_plugin_status 156 unique_segment_for_sections(const char* segment_name, 157 uint64_t flags, 158 uint64_t align, 159 const struct ld_plugin_section *section_list, 160 unsigned int num_sections); 161 162 static enum ld_plugin_status 163 get_input_section_alignment(const struct ld_plugin_section section, 164 unsigned int* addralign); 165 166 static enum ld_plugin_status 167 get_input_section_size(const struct ld_plugin_section section, 168 uint64_t* secsize); 169 170 }; 171 172 #endif // ENABLE_PLUGINS 173 174 static Pluginobj* make_sized_plugin_object(Input_file* input_file, 175 off_t offset, off_t filesize); 176 177 // Plugin methods. 178 179 // Load one plugin library. 180 181 void 182 Plugin::load() 183 { 184 #ifdef ENABLE_PLUGINS 185 // Load the plugin library. 186 // FIXME: Look for the library in standard locations. 187 this->handle_ = dlopen(this->filename_.c_str(), RTLD_NOW); 188 if (this->handle_ == NULL) 189 { 190 gold_error(_("%s: could not load plugin library: %s"), 191 this->filename_.c_str(), dlerror()); 192 return; 193 } 194 195 // Find the plugin's onload entry point. 196 void* ptr = dlsym(this->handle_, "onload"); 197 if (ptr == NULL) 198 { 199 gold_error(_("%s: could not find onload entry point"), 200 this->filename_.c_str()); 201 return; 202 } 203 ld_plugin_onload onload; 204 gold_assert(sizeof(onload) == sizeof(ptr)); 205 memcpy(&onload, &ptr, sizeof(ptr)); 206 207 // Get the linker's version number. 208 const char* ver = get_version_string(); 209 int major = 0; 210 int minor = 0; 211 sscanf(ver, "%d.%d", &major, &minor); 212 213 // Allocate and populate a transfer vector. 214 const int tv_fixed_size = 29; 215 216 int tv_size = this->args_.size() + tv_fixed_size; 217 ld_plugin_tv* tv = new ld_plugin_tv[tv_size]; 218 219 // Put LDPT_MESSAGE at the front of the list so the plugin can use it 220 // while processing subsequent entries. 221 int i = 0; 222 tv[i].tv_tag = LDPT_MESSAGE; 223 tv[i].tv_u.tv_message = message; 224 225 ++i; 226 tv[i].tv_tag = LDPT_API_VERSION; 227 tv[i].tv_u.tv_val = LD_PLUGIN_API_VERSION; 228 229 ++i; 230 tv[i].tv_tag = LDPT_GOLD_VERSION; 231 tv[i].tv_u.tv_val = major * 100 + minor; 232 233 ++i; 234 tv[i].tv_tag = LDPT_LINKER_OUTPUT; 235 if (parameters->options().relocatable()) 236 tv[i].tv_u.tv_val = LDPO_REL; 237 else if (parameters->options().shared()) 238 tv[i].tv_u.tv_val = LDPO_DYN; 239 else if (parameters->options().pie()) 240 tv[i].tv_u.tv_val = LDPO_PIE; 241 else 242 tv[i].tv_u.tv_val = LDPO_EXEC; 243 244 ++i; 245 tv[i].tv_tag = LDPT_OUTPUT_NAME; 246 tv[i].tv_u.tv_string = parameters->options().output(); 247 248 for (unsigned int j = 0; j < this->args_.size(); ++j) 249 { 250 ++i; 251 tv[i].tv_tag = LDPT_OPTION; 252 tv[i].tv_u.tv_string = this->args_[j].c_str(); 253 } 254 255 ++i; 256 tv[i].tv_tag = LDPT_REGISTER_CLAIM_FILE_HOOK; 257 tv[i].tv_u.tv_register_claim_file = register_claim_file; 258 259 ++i; 260 tv[i].tv_tag = LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK; 261 tv[i].tv_u.tv_register_all_symbols_read = register_all_symbols_read; 262 263 ++i; 264 tv[i].tv_tag = LDPT_REGISTER_CLEANUP_HOOK; 265 tv[i].tv_u.tv_register_cleanup = register_cleanup; 266 267 ++i; 268 tv[i].tv_tag = LDPT_ADD_SYMBOLS; 269 tv[i].tv_u.tv_add_symbols = add_symbols; 270 271 ++i; 272 tv[i].tv_tag = LDPT_GET_INPUT_FILE; 273 tv[i].tv_u.tv_get_input_file = get_input_file; 274 275 ++i; 276 tv[i].tv_tag = LDPT_GET_VIEW; 277 tv[i].tv_u.tv_get_view = get_view; 278 279 ++i; 280 tv[i].tv_tag = LDPT_RELEASE_INPUT_FILE; 281 tv[i].tv_u.tv_release_input_file = release_input_file; 282 283 ++i; 284 tv[i].tv_tag = LDPT_GET_SYMBOLS; 285 tv[i].tv_u.tv_get_symbols = get_symbols; 286 287 ++i; 288 tv[i].tv_tag = LDPT_GET_SYMBOLS_V2; 289 tv[i].tv_u.tv_get_symbols = get_symbols_v2; 290 291 ++i; 292 tv[i].tv_tag = LDPT_GET_SYMBOLS_V3; 293 tv[i].tv_u.tv_get_symbols = get_symbols_v3; 294 295 ++i; 296 tv[i].tv_tag = LDPT_ADD_INPUT_FILE; 297 tv[i].tv_u.tv_add_input_file = add_input_file; 298 299 ++i; 300 tv[i].tv_tag = LDPT_ADD_INPUT_LIBRARY; 301 tv[i].tv_u.tv_add_input_library = add_input_library; 302 303 ++i; 304 tv[i].tv_tag = LDPT_SET_EXTRA_LIBRARY_PATH; 305 tv[i].tv_u.tv_set_extra_library_path = set_extra_library_path; 306 307 ++i; 308 tv[i].tv_tag = LDPT_GET_INPUT_SECTION_COUNT; 309 tv[i].tv_u.tv_get_input_section_count = get_input_section_count; 310 311 ++i; 312 tv[i].tv_tag = LDPT_GET_INPUT_SECTION_TYPE; 313 tv[i].tv_u.tv_get_input_section_type = get_input_section_type; 314 315 ++i; 316 tv[i].tv_tag = LDPT_GET_INPUT_SECTION_NAME; 317 tv[i].tv_u.tv_get_input_section_name = get_input_section_name; 318 319 ++i; 320 tv[i].tv_tag = LDPT_GET_INPUT_SECTION_CONTENTS; 321 tv[i].tv_u.tv_get_input_section_contents = get_input_section_contents; 322 323 ++i; 324 tv[i].tv_tag = LDPT_UPDATE_SECTION_ORDER; 325 tv[i].tv_u.tv_update_section_order = update_section_order; 326 327 ++i; 328 tv[i].tv_tag = LDPT_ALLOW_SECTION_ORDERING; 329 tv[i].tv_u.tv_allow_section_ordering = allow_section_ordering; 330 331 ++i; 332 tv[i].tv_tag = LDPT_ALLOW_UNIQUE_SEGMENT_FOR_SECTIONS; 333 tv[i].tv_u.tv_allow_unique_segment_for_sections 334 = allow_unique_segment_for_sections; 335 336 ++i; 337 tv[i].tv_tag = LDPT_UNIQUE_SEGMENT_FOR_SECTIONS; 338 tv[i].tv_u.tv_unique_segment_for_sections = unique_segment_for_sections; 339 340 ++i; 341 tv[i].tv_tag = LDPT_GET_INPUT_SECTION_ALIGNMENT; 342 tv[i].tv_u.tv_get_input_section_alignment = get_input_section_alignment; 343 344 ++i; 345 tv[i].tv_tag = LDPT_GET_INPUT_SECTION_SIZE; 346 tv[i].tv_u.tv_get_input_section_size = get_input_section_size; 347 348 ++i; 349 tv[i].tv_tag = LDPT_NULL; 350 tv[i].tv_u.tv_val = 0; 351 352 gold_assert(i == tv_size - 1); 353 354 // Call the onload entry point. 355 (*onload)(tv); 356 357 delete[] tv; 358 #endif // ENABLE_PLUGINS 359 } 360 361 // Call the plugin claim-file handler. 362 363 inline bool 364 Plugin::claim_file(struct ld_plugin_input_file* plugin_input_file) 365 { 366 int claimed = 0; 367 368 if (this->claim_file_handler_ != NULL) 369 { 370 (*this->claim_file_handler_)(plugin_input_file, &claimed); 371 if (claimed) 372 return true; 373 } 374 return false; 375 } 376 377 // Call the all-symbols-read handler. 378 379 inline void 380 Plugin::all_symbols_read() 381 { 382 if (this->all_symbols_read_handler_ != NULL) 383 (*this->all_symbols_read_handler_)(); 384 } 385 386 // Call the cleanup handler. 387 388 inline void 389 Plugin::cleanup() 390 { 391 if (this->cleanup_handler_ != NULL && !this->cleanup_done_) 392 { 393 // Set this flag before calling to prevent a recursive plunge 394 // in the event that a plugin's cleanup handler issues a 395 // fatal error. 396 this->cleanup_done_ = true; 397 (*this->cleanup_handler_)(); 398 } 399 } 400 401 // This task is used to rescan archives as needed. 402 403 class Plugin_rescan : public Task 404 { 405 public: 406 Plugin_rescan(Task_token* this_blocker, Task_token* next_blocker) 407 : this_blocker_(this_blocker), next_blocker_(next_blocker) 408 { } 409 410 ~Plugin_rescan() 411 { 412 delete this->this_blocker_; 413 } 414 415 Task_token* 416 is_runnable() 417 { 418 if (this->this_blocker_->is_blocked()) 419 return this->this_blocker_; 420 return NULL; 421 } 422 423 void 424 locks(Task_locker* tl) 425 { tl->add(this, this->next_blocker_); } 426 427 void 428 run(Workqueue*) 429 { parameters->options().plugins()->rescan(this); } 430 431 std::string 432 get_name() const 433 { return "Plugin_rescan"; } 434 435 private: 436 Task_token* this_blocker_; 437 Task_token* next_blocker_; 438 }; 439 440 // Plugin_manager methods. 441 442 Plugin_manager::~Plugin_manager() 443 { 444 for (Plugin_list::iterator p = this->plugins_.begin(); 445 p != this->plugins_.end(); 446 ++p) 447 delete *p; 448 this->plugins_.clear(); 449 for (Object_list::iterator obj = this->objects_.begin(); 450 obj != this->objects_.end(); 451 ++obj) 452 delete *obj; 453 this->objects_.clear(); 454 delete this->lock_; 455 } 456 457 // Load all plugin libraries. 458 459 void 460 Plugin_manager::load_plugins(Layout* layout) 461 { 462 this->layout_ = layout; 463 for (this->current_ = this->plugins_.begin(); 464 this->current_ != this->plugins_.end(); 465 ++this->current_) 466 (*this->current_)->load(); 467 } 468 469 // Call the plugin claim-file handlers in turn to see if any claim the file. 470 471 Pluginobj* 472 Plugin_manager::claim_file(Input_file* input_file, off_t offset, 473 off_t filesize, Object* elf_object) 474 { 475 bool lock_initialized = this->initialize_lock_.initialize(); 476 477 gold_assert(lock_initialized); 478 Hold_lock hl(*this->lock_); 479 if (this->in_replacement_phase_) 480 return NULL; 481 482 unsigned int handle = this->objects_.size(); 483 this->input_file_ = input_file; 484 this->plugin_input_file_.name = input_file->filename().c_str(); 485 this->plugin_input_file_.fd = input_file->file().descriptor(); 486 this->plugin_input_file_.offset = offset; 487 this->plugin_input_file_.filesize = filesize; 488 this->plugin_input_file_.handle = reinterpret_cast<void*>(handle); 489 if (elf_object != NULL) 490 this->objects_.push_back(elf_object); 491 this->in_claim_file_handler_ = true; 492 493 for (this->current_ = this->plugins_.begin(); 494 this->current_ != this->plugins_.end(); 495 ++this->current_) 496 { 497 if ((*this->current_)->claim_file(&this->plugin_input_file_)) 498 { 499 this->any_claimed_ = true; 500 this->in_claim_file_handler_ = false; 501 502 if (this->objects_.size() > handle 503 && this->objects_[handle]->pluginobj() != NULL) 504 return this->objects_[handle]->pluginobj(); 505 506 // If the plugin claimed the file but did not call the 507 // add_symbols callback, we need to create the Pluginobj now. 508 Pluginobj* obj = this->make_plugin_object(handle); 509 return obj; 510 } 511 } 512 513 this->in_claim_file_handler_ = false; 514 return NULL; 515 } 516 517 // Save an archive. This is used so that a plugin can add a file 518 // which refers to a symbol which was not previously referenced. In 519 // that case we want to pretend that the symbol was referenced before, 520 // and pull in the archive object. 521 522 void 523 Plugin_manager::save_archive(Archive* archive) 524 { 525 if (this->in_replacement_phase_ || !this->any_claimed_) 526 delete archive; 527 else 528 this->rescannable_.push_back(Rescannable(archive)); 529 } 530 531 // Save an Input_group. This is like save_archive. 532 533 void 534 Plugin_manager::save_input_group(Input_group* input_group) 535 { 536 if (this->in_replacement_phase_ || !this->any_claimed_) 537 delete input_group; 538 else 539 this->rescannable_.push_back(Rescannable(input_group)); 540 } 541 542 // Call the all-symbols-read handlers. 543 544 void 545 Plugin_manager::all_symbols_read(Workqueue* workqueue, Task* task, 546 Input_objects* input_objects, 547 Symbol_table* symtab, 548 Dirsearch* dirpath, Mapfile* mapfile, 549 Task_token** last_blocker) 550 { 551 this->in_replacement_phase_ = true; 552 this->workqueue_ = workqueue; 553 this->task_ = task; 554 this->input_objects_ = input_objects; 555 this->symtab_ = symtab; 556 this->dirpath_ = dirpath; 557 this->mapfile_ = mapfile; 558 this->this_blocker_ = NULL; 559 560 for (this->current_ = this->plugins_.begin(); 561 this->current_ != this->plugins_.end(); 562 ++this->current_) 563 (*this->current_)->all_symbols_read(); 564 565 if (this->any_added_) 566 { 567 Task_token* next_blocker = new Task_token(true); 568 next_blocker->add_blocker(); 569 workqueue->queue(new Plugin_rescan(this->this_blocker_, next_blocker)); 570 this->this_blocker_ = next_blocker; 571 } 572 573 *last_blocker = this->this_blocker_; 574 } 575 576 // This is called when we see a new undefined symbol. If we are in 577 // the replacement phase, this means that we may need to rescan some 578 // archives we have previously seen. 579 580 void 581 Plugin_manager::new_undefined_symbol(Symbol* sym) 582 { 583 if (this->in_replacement_phase_) 584 this->undefined_symbols_.push_back(sym); 585 } 586 587 // Rescan archives as needed. This handles the case where a new 588 // object file added by a plugin has an undefined reference to some 589 // symbol defined in an archive. 590 591 void 592 Plugin_manager::rescan(Task* task) 593 { 594 size_t rescan_pos = 0; 595 size_t rescan_size = this->rescannable_.size(); 596 while (!this->undefined_symbols_.empty()) 597 { 598 if (rescan_pos >= rescan_size) 599 { 600 this->undefined_symbols_.clear(); 601 return; 602 } 603 604 Undefined_symbol_list undefs; 605 undefs.reserve(this->undefined_symbols_.size()); 606 this->undefined_symbols_.swap(undefs); 607 608 size_t min_rescan_pos = rescan_size; 609 610 for (Undefined_symbol_list::const_iterator p = undefs.begin(); 611 p != undefs.end(); 612 ++p) 613 { 614 if (!(*p)->is_undefined()) 615 continue; 616 617 this->undefined_symbols_.push_back(*p); 618 619 // Find the first rescan archive which defines this symbol, 620 // starting at the current rescan position. The rescan position 621 // exists so that given -la -lb -lc we don't look for undefined 622 // symbols in -lb back in -la, but instead get the definition 623 // from -lc. Don't bother to look past the current minimum 624 // rescan position. 625 for (size_t i = rescan_pos; i < min_rescan_pos; ++i) 626 { 627 if (this->rescannable_defines(i, *p)) 628 { 629 min_rescan_pos = i; 630 break; 631 } 632 } 633 } 634 635 if (min_rescan_pos >= rescan_size) 636 { 637 // We didn't find any rescannable archives which define any 638 // undefined symbols. 639 return; 640 } 641 642 const Rescannable& r(this->rescannable_[min_rescan_pos]); 643 if (r.is_archive) 644 { 645 Task_lock_obj<Archive> tl(task, r.u.archive); 646 r.u.archive->add_symbols(this->symtab_, this->layout_, 647 this->input_objects_, this->mapfile_); 648 } 649 else 650 { 651 size_t next_saw_undefined = this->symtab_->saw_undefined(); 652 size_t saw_undefined; 653 do 654 { 655 saw_undefined = next_saw_undefined; 656 657 for (Input_group::const_iterator p = r.u.input_group->begin(); 658 p != r.u.input_group->end(); 659 ++p) 660 { 661 Task_lock_obj<Archive> tl(task, *p); 662 663 (*p)->add_symbols(this->symtab_, this->layout_, 664 this->input_objects_, this->mapfile_); 665 } 666 667 next_saw_undefined = this->symtab_->saw_undefined(); 668 } 669 while (saw_undefined != next_saw_undefined); 670 } 671 672 for (size_t i = rescan_pos; i < min_rescan_pos + 1; ++i) 673 { 674 if (this->rescannable_[i].is_archive) 675 delete this->rescannable_[i].u.archive; 676 else 677 delete this->rescannable_[i].u.input_group; 678 } 679 680 rescan_pos = min_rescan_pos + 1; 681 } 682 } 683 684 // Return whether the rescannable at index I defines SYM. 685 686 bool 687 Plugin_manager::rescannable_defines(size_t i, Symbol* sym) 688 { 689 const Rescannable& r(this->rescannable_[i]); 690 if (r.is_archive) 691 return r.u.archive->defines_symbol(sym); 692 else 693 { 694 for (Input_group::const_iterator p = r.u.input_group->begin(); 695 p != r.u.input_group->end(); 696 ++p) 697 { 698 if ((*p)->defines_symbol(sym)) 699 return true; 700 } 701 return false; 702 } 703 } 704 705 // Layout deferred objects. 706 707 void 708 Plugin_manager::layout_deferred_objects() 709 { 710 Deferred_layout_list::iterator obj; 711 712 for (obj = this->deferred_layout_objects_.begin(); 713 obj != this->deferred_layout_objects_.end(); 714 ++obj) 715 { 716 // Lock the object so we can read from it. This is only called 717 // single-threaded from queue_middle_tasks, so it is OK to lock. 718 // Unfortunately we have no way to pass in a Task token. 719 const Task* dummy_task = reinterpret_cast<const Task*>(-1); 720 Task_lock_obj<Object> tl(dummy_task, *obj); 721 (*obj)->layout_deferred_sections(this->layout_); 722 } 723 } 724 725 // Call the cleanup handlers. 726 727 void 728 Plugin_manager::cleanup() 729 { 730 if (this->any_added_) 731 { 732 // If any input files were added, close all the input files. 733 // This is because the plugin may want to remove them, and on 734 // Windows you are not allowed to remove an open file. 735 close_all_descriptors(); 736 } 737 738 for (this->current_ = this->plugins_.begin(); 739 this->current_ != this->plugins_.end(); 740 ++this->current_) 741 (*this->current_)->cleanup(); 742 } 743 744 // Make a new Pluginobj object. This is called when the plugin calls 745 // the add_symbols API. 746 747 Pluginobj* 748 Plugin_manager::make_plugin_object(unsigned int handle) 749 { 750 // Make sure we aren't asked to make an object for the same handle twice. 751 if (this->objects_.size() != handle 752 && this->objects_[handle]->pluginobj() != NULL) 753 return NULL; 754 755 Pluginobj* obj = make_sized_plugin_object(this->input_file_, 756 this->plugin_input_file_.offset, 757 this->plugin_input_file_.filesize); 758 759 760 // If the elf object for this file was pushed into the objects_ vector, delete 761 // it to make room for the Pluginobj as this file is claimed. 762 if (this->objects_.size() != handle) 763 this->objects_.pop_back(); 764 765 this->objects_.push_back(obj); 766 return obj; 767 } 768 769 // Get the input file information with an open (possibly re-opened) 770 // file descriptor. 771 772 ld_plugin_status 773 Plugin_manager::get_input_file(unsigned int handle, 774 struct ld_plugin_input_file* file) 775 { 776 Pluginobj* obj = this->object(handle)->pluginobj(); 777 if (obj == NULL) 778 return LDPS_BAD_HANDLE; 779 780 obj->lock(this->task_); 781 file->name = obj->filename().c_str(); 782 file->fd = obj->descriptor(); 783 file->offset = obj->offset(); 784 file->filesize = obj->filesize(); 785 file->handle = reinterpret_cast<void*>(handle); 786 return LDPS_OK; 787 } 788 789 // Release the input file. 790 791 ld_plugin_status 792 Plugin_manager::release_input_file(unsigned int handle) 793 { 794 if (this->object(handle) == NULL) 795 return LDPS_BAD_HANDLE; 796 797 Pluginobj* obj = this->object(handle)->pluginobj(); 798 799 if (obj == NULL) 800 return LDPS_BAD_HANDLE; 801 802 obj->unlock(this->task_); 803 return LDPS_OK; 804 } 805 806 // Get the elf object corresponding to the handle. Return NULL if we 807 // found a Pluginobj instead. 808 809 Object* 810 Plugin_manager::get_elf_object(const void* handle) 811 { 812 Object* obj = this->object( 813 static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle))); 814 815 // The object should not be a Pluginobj. 816 if (obj == NULL 817 || obj->pluginobj() != NULL) 818 return NULL; 819 820 return obj; 821 } 822 823 ld_plugin_status 824 Plugin_manager::get_view(unsigned int handle, const void **viewp) 825 { 826 off_t offset; 827 size_t filesize; 828 Input_file *input_file; 829 if (this->in_claim_file_handler_) 830 { 831 // We are being called from the claim_file hook. 832 const struct ld_plugin_input_file &f = this->plugin_input_file_; 833 offset = f.offset; 834 filesize = f.filesize; 835 input_file = this->input_file_; 836 } 837 else 838 { 839 // An already claimed file. 840 if (this->object(handle) == NULL) 841 return LDPS_BAD_HANDLE; 842 Pluginobj* obj = this->object(handle)->pluginobj(); 843 if (obj == NULL) 844 return LDPS_BAD_HANDLE; 845 offset = obj->offset(); 846 filesize = obj->filesize(); 847 input_file = obj->input_file(); 848 } 849 *viewp = (void*) input_file->file().get_view(offset, 0, filesize, false, 850 false); 851 return LDPS_OK; 852 } 853 854 // Add a new library path. 855 856 ld_plugin_status 857 Plugin_manager::set_extra_library_path(const char* path) 858 { 859 this->extra_search_path_ = std::string(path); 860 return LDPS_OK; 861 } 862 863 // Add a new input file. 864 865 ld_plugin_status 866 Plugin_manager::add_input_file(const char* pathname, bool is_lib) 867 { 868 Input_file_argument file(pathname, 869 (is_lib 870 ? Input_file_argument::INPUT_FILE_TYPE_LIBRARY 871 : Input_file_argument::INPUT_FILE_TYPE_FILE), 872 (is_lib 873 ? this->extra_search_path_.c_str() 874 : ""), 875 false, 876 this->options_); 877 Input_argument* input_argument = new Input_argument(file); 878 Task_token* next_blocker = new Task_token(true); 879 next_blocker->add_blocker(); 880 if (parameters->incremental()) 881 gold_error(_("input files added by plug-ins in --incremental mode not " 882 "supported yet")); 883 this->workqueue_->queue_soon(new Read_symbols(this->input_objects_, 884 this->symtab_, 885 this->layout_, 886 this->dirpath_, 887 0, 888 this->mapfile_, 889 input_argument, 890 NULL, 891 NULL, 892 this->this_blocker_, 893 next_blocker)); 894 this->this_blocker_ = next_blocker; 895 this->any_added_ = true; 896 return LDPS_OK; 897 } 898 899 // Class Pluginobj. 900 901 Pluginobj::Pluginobj(const std::string& name, Input_file* input_file, 902 off_t offset, off_t filesize) 903 : Object(name, input_file, false, offset), 904 nsyms_(0), syms_(NULL), symbols_(), filesize_(filesize), comdat_map_() 905 { 906 } 907 908 // Return TRUE if a defined symbol is referenced from outside the 909 // universe of claimed objects. Only references from relocatable, 910 // non-IR (unclaimed) objects count as a reference. References from 911 // dynamic objects count only as "visible". 912 913 static inline bool 914 is_referenced_from_outside(Symbol* lsym) 915 { 916 if (lsym->in_real_elf()) 917 return true; 918 if (parameters->options().relocatable()) 919 return true; 920 if (parameters->options().is_undefined(lsym->name())) 921 return true; 922 return false; 923 } 924 925 // Return TRUE if a defined symbol might be reachable from outside the 926 // load module. 927 928 static inline bool 929 is_visible_from_outside(Symbol* lsym) 930 { 931 if (lsym->in_dyn()) 932 return true; 933 if (parameters->options().export_dynamic() || parameters->options().shared()) 934 return lsym->is_externally_visible(); 935 return false; 936 } 937 938 // Get symbol resolution info. 939 940 ld_plugin_status 941 Pluginobj::get_symbol_resolution_info(Symbol_table* symtab, 942 int nsyms, 943 ld_plugin_symbol* syms, 944 int version) const 945 { 946 // For version 1 of this interface, we cannot use 947 // LDPR_PREVAILING_DEF_IRONLY_EXP, so we return LDPR_PREVAILING_DEF 948 // instead. 949 const ld_plugin_symbol_resolution ldpr_prevailing_def_ironly_exp 950 = (version > 1 951 ? LDPR_PREVAILING_DEF_IRONLY_EXP 952 : LDPR_PREVAILING_DEF); 953 954 if (nsyms > this->nsyms_) 955 return LDPS_NO_SYMS; 956 957 if (static_cast<size_t>(nsyms) > this->symbols_.size()) 958 { 959 // We never decided to include this object. We mark all symbols as 960 // preempted. 961 gold_assert(this->symbols_.size() == 0); 962 for (int i = 0; i < nsyms; i++) 963 syms[i].resolution = LDPR_PREEMPTED_REG; 964 return version > 2 ? LDPS_NO_SYMS : LDPS_OK; 965 } 966 967 for (int i = 0; i < nsyms; i++) 968 { 969 ld_plugin_symbol* isym = &syms[i]; 970 Symbol* lsym = this->symbols_[i]; 971 if (lsym->is_forwarder()) 972 lsym = symtab->resolve_forwards(lsym); 973 ld_plugin_symbol_resolution res = LDPR_UNKNOWN; 974 975 if (lsym->is_undefined()) 976 // The symbol remains undefined. 977 res = LDPR_UNDEF; 978 else if (isym->def == LDPK_UNDEF 979 || isym->def == LDPK_WEAKUNDEF 980 || isym->def == LDPK_COMMON) 981 { 982 // The original symbol was undefined or common. 983 if (lsym->source() != Symbol::FROM_OBJECT) 984 res = LDPR_RESOLVED_EXEC; 985 else if (lsym->object()->pluginobj() == this) 986 { 987 if (is_referenced_from_outside(lsym)) 988 res = LDPR_PREVAILING_DEF; 989 else if (is_visible_from_outside(lsym)) 990 res = ldpr_prevailing_def_ironly_exp; 991 else 992 res = LDPR_PREVAILING_DEF_IRONLY; 993 } 994 else if (lsym->object()->pluginobj() != NULL) 995 res = LDPR_RESOLVED_IR; 996 else if (lsym->object()->is_dynamic()) 997 res = LDPR_RESOLVED_DYN; 998 else 999 res = LDPR_RESOLVED_EXEC; 1000 } 1001 else 1002 { 1003 // The original symbol was a definition. 1004 if (lsym->source() != Symbol::FROM_OBJECT) 1005 res = LDPR_PREEMPTED_REG; 1006 else if (lsym->object() == static_cast<const Object*>(this)) 1007 { 1008 if (is_referenced_from_outside(lsym)) 1009 res = LDPR_PREVAILING_DEF; 1010 else if (is_visible_from_outside(lsym)) 1011 res = ldpr_prevailing_def_ironly_exp; 1012 else 1013 res = LDPR_PREVAILING_DEF_IRONLY; 1014 } 1015 else 1016 res = (lsym->object()->pluginobj() != NULL 1017 ? LDPR_PREEMPTED_IR 1018 : LDPR_PREEMPTED_REG); 1019 } 1020 isym->resolution = res; 1021 } 1022 return LDPS_OK; 1023 } 1024 1025 // Return TRUE if the comdat group with key COMDAT_KEY from this object 1026 // should be kept. 1027 1028 bool 1029 Pluginobj::include_comdat_group(std::string comdat_key, Layout* layout) 1030 { 1031 std::pair<Comdat_map::iterator, bool> ins = 1032 this->comdat_map_.insert(std::make_pair(comdat_key, false)); 1033 1034 // If this is the first time we've seen this comdat key, ask the 1035 // layout object whether it should be included. 1036 if (ins.second) 1037 ins.first->second = layout->find_or_add_kept_section(comdat_key, 1038 NULL, 0, true, 1039 true, NULL); 1040 1041 return ins.first->second; 1042 } 1043 1044 // Class Sized_pluginobj. 1045 1046 template<int size, bool big_endian> 1047 Sized_pluginobj<size, big_endian>::Sized_pluginobj( 1048 const std::string& name, 1049 Input_file* input_file, 1050 off_t offset, 1051 off_t filesize) 1052 : Pluginobj(name, input_file, offset, filesize) 1053 { 1054 } 1055 1056 // Read the symbols. Not used for plugin objects. 1057 1058 template<int size, bool big_endian> 1059 void 1060 Sized_pluginobj<size, big_endian>::do_read_symbols(Read_symbols_data*) 1061 { 1062 gold_unreachable(); 1063 } 1064 1065 // Lay out the input sections. Not used for plugin objects. 1066 1067 template<int size, bool big_endian> 1068 void 1069 Sized_pluginobj<size, big_endian>::do_layout(Symbol_table*, Layout*, 1070 Read_symbols_data*) 1071 { 1072 gold_unreachable(); 1073 } 1074 1075 // Add the symbols to the symbol table. 1076 1077 template<int size, bool big_endian> 1078 void 1079 Sized_pluginobj<size, big_endian>::do_add_symbols(Symbol_table* symtab, 1080 Read_symbols_data*, 1081 Layout* layout) 1082 { 1083 const int sym_size = elfcpp::Elf_sizes<size>::sym_size; 1084 unsigned char symbuf[sym_size]; 1085 elfcpp::Sym<size, big_endian> sym(symbuf); 1086 elfcpp::Sym_write<size, big_endian> osym(symbuf); 1087 1088 this->symbols_.resize(this->nsyms_); 1089 1090 for (int i = 0; i < this->nsyms_; ++i) 1091 { 1092 const struct ld_plugin_symbol* isym = &this->syms_[i]; 1093 const char* name = isym->name; 1094 const char* ver = isym->version; 1095 elfcpp::Elf_Half shndx; 1096 elfcpp::STB bind; 1097 elfcpp::STV vis; 1098 1099 if (name != NULL && name[0] == '\0') 1100 name = NULL; 1101 if (ver != NULL && ver[0] == '\0') 1102 ver = NULL; 1103 1104 switch (isym->def) 1105 { 1106 case LDPK_WEAKDEF: 1107 case LDPK_WEAKUNDEF: 1108 bind = elfcpp::STB_WEAK; 1109 break; 1110 case LDPK_DEF: 1111 case LDPK_UNDEF: 1112 case LDPK_COMMON: 1113 default: 1114 bind = elfcpp::STB_GLOBAL; 1115 break; 1116 } 1117 1118 switch (isym->def) 1119 { 1120 case LDPK_DEF: 1121 case LDPK_WEAKDEF: 1122 shndx = elfcpp::SHN_ABS; 1123 break; 1124 case LDPK_COMMON: 1125 shndx = elfcpp::SHN_COMMON; 1126 break; 1127 case LDPK_UNDEF: 1128 case LDPK_WEAKUNDEF: 1129 default: 1130 shndx = elfcpp::SHN_UNDEF; 1131 break; 1132 } 1133 1134 switch (isym->visibility) 1135 { 1136 case LDPV_PROTECTED: 1137 vis = elfcpp::STV_PROTECTED; 1138 break; 1139 case LDPV_INTERNAL: 1140 vis = elfcpp::STV_INTERNAL; 1141 break; 1142 case LDPV_HIDDEN: 1143 vis = elfcpp::STV_HIDDEN; 1144 break; 1145 case LDPV_DEFAULT: 1146 default: 1147 vis = elfcpp::STV_DEFAULT; 1148 break; 1149 } 1150 1151 if (isym->comdat_key != NULL 1152 && isym->comdat_key[0] != '\0' 1153 && !this->include_comdat_group(isym->comdat_key, layout)) 1154 shndx = elfcpp::SHN_UNDEF; 1155 1156 osym.put_st_name(0); 1157 osym.put_st_value(0); 1158 osym.put_st_size(0); 1159 osym.put_st_info(bind, elfcpp::STT_NOTYPE); 1160 osym.put_st_other(vis, 0); 1161 osym.put_st_shndx(shndx); 1162 1163 this->symbols_[i] = 1164 symtab->add_from_pluginobj<size, big_endian>(this, name, ver, &sym); 1165 } 1166 } 1167 1168 template<int size, bool big_endian> 1169 Archive::Should_include 1170 Sized_pluginobj<size, big_endian>::do_should_include_member( 1171 Symbol_table* symtab, 1172 Layout* layout, 1173 Read_symbols_data*, 1174 std::string* why) 1175 { 1176 char* tmpbuf = NULL; 1177 size_t tmpbuflen = 0; 1178 1179 for (int i = 0; i < this->nsyms_; ++i) 1180 { 1181 const struct ld_plugin_symbol& sym = this->syms_[i]; 1182 if (sym.def == LDPK_UNDEF || sym.def == LDPK_WEAKUNDEF) 1183 continue; 1184 const char* name = sym.name; 1185 Symbol* symbol; 1186 Archive::Should_include t = Archive::should_include_member(symtab, 1187 layout, 1188 name, 1189 &symbol, why, 1190 &tmpbuf, 1191 &tmpbuflen); 1192 if (t == Archive::SHOULD_INCLUDE_YES) 1193 { 1194 if (tmpbuf != NULL) 1195 free(tmpbuf); 1196 return t; 1197 } 1198 } 1199 if (tmpbuf != NULL) 1200 free(tmpbuf); 1201 return Archive::SHOULD_INCLUDE_UNKNOWN; 1202 } 1203 1204 // Iterate over global symbols, calling a visitor class V for each. 1205 1206 template<int size, bool big_endian> 1207 void 1208 Sized_pluginobj<size, big_endian>::do_for_all_global_symbols( 1209 Read_symbols_data*, 1210 Library_base::Symbol_visitor_base* v) 1211 { 1212 for (int i = 0; i < this->nsyms_; ++i) 1213 { 1214 const struct ld_plugin_symbol& sym = this->syms_[i]; 1215 if (sym.def != LDPK_UNDEF) 1216 v->visit(sym.name); 1217 } 1218 } 1219 1220 // Iterate over local symbols, calling a visitor class V for each GOT offset 1221 // associated with a local symbol. 1222 template<int size, bool big_endian> 1223 void 1224 Sized_pluginobj<size, big_endian>::do_for_all_local_got_entries( 1225 Got_offset_list::Visitor*) const 1226 { 1227 gold_unreachable(); 1228 } 1229 1230 // Get the size of a section. Not used for plugin objects. 1231 1232 template<int size, bool big_endian> 1233 uint64_t 1234 Sized_pluginobj<size, big_endian>::do_section_size(unsigned int) 1235 { 1236 gold_unreachable(); 1237 return 0; 1238 } 1239 1240 // Get the name of a section. Not used for plugin objects. 1241 1242 template<int size, bool big_endian> 1243 std::string 1244 Sized_pluginobj<size, big_endian>::do_section_name(unsigned int) const 1245 { 1246 gold_unreachable(); 1247 return std::string(); 1248 } 1249 1250 // Return a view of the contents of a section. Not used for plugin objects. 1251 1252 template<int size, bool big_endian> 1253 const unsigned char* 1254 Sized_pluginobj<size, big_endian>::do_section_contents( 1255 unsigned int, 1256 section_size_type*, 1257 bool) 1258 { 1259 gold_unreachable(); 1260 return NULL; 1261 } 1262 1263 // Return section flags. Not used for plugin objects. 1264 1265 template<int size, bool big_endian> 1266 uint64_t 1267 Sized_pluginobj<size, big_endian>::do_section_flags(unsigned int) 1268 { 1269 gold_unreachable(); 1270 return 0; 1271 } 1272 1273 // Return section entsize. Not used for plugin objects. 1274 1275 template<int size, bool big_endian> 1276 uint64_t 1277 Sized_pluginobj<size, big_endian>::do_section_entsize(unsigned int) 1278 { 1279 gold_unreachable(); 1280 return 0; 1281 } 1282 1283 // Return section address. Not used for plugin objects. 1284 1285 template<int size, bool big_endian> 1286 uint64_t 1287 Sized_pluginobj<size, big_endian>::do_section_address(unsigned int) 1288 { 1289 gold_unreachable(); 1290 return 0; 1291 } 1292 1293 // Return section type. Not used for plugin objects. 1294 1295 template<int size, bool big_endian> 1296 unsigned int 1297 Sized_pluginobj<size, big_endian>::do_section_type(unsigned int) 1298 { 1299 gold_unreachable(); 1300 return 0; 1301 } 1302 1303 // Return the section link field. Not used for plugin objects. 1304 1305 template<int size, bool big_endian> 1306 unsigned int 1307 Sized_pluginobj<size, big_endian>::do_section_link(unsigned int) 1308 { 1309 gold_unreachable(); 1310 return 0; 1311 } 1312 1313 // Return the section link field. Not used for plugin objects. 1314 1315 template<int size, bool big_endian> 1316 unsigned int 1317 Sized_pluginobj<size, big_endian>::do_section_info(unsigned int) 1318 { 1319 gold_unreachable(); 1320 return 0; 1321 } 1322 1323 // Return the section alignment. Not used for plugin objects. 1324 1325 template<int size, bool big_endian> 1326 uint64_t 1327 Sized_pluginobj<size, big_endian>::do_section_addralign(unsigned int) 1328 { 1329 gold_unreachable(); 1330 return 0; 1331 } 1332 1333 // Return the Xindex structure to use. Not used for plugin objects. 1334 1335 template<int size, bool big_endian> 1336 Xindex* 1337 Sized_pluginobj<size, big_endian>::do_initialize_xindex() 1338 { 1339 gold_unreachable(); 1340 return NULL; 1341 } 1342 1343 // Get symbol counts. Don't count plugin objects; the replacement 1344 // files will provide the counts. 1345 1346 template<int size, bool big_endian> 1347 void 1348 Sized_pluginobj<size, big_endian>::do_get_global_symbol_counts( 1349 const Symbol_table*, 1350 size_t* defined, 1351 size_t* used) const 1352 { 1353 *defined = 0; 1354 *used = 0; 1355 } 1356 1357 // Get symbols. Not used for plugin objects. 1358 1359 template<int size, bool big_endian> 1360 const Object::Symbols* 1361 Sized_pluginobj<size, big_endian>::do_get_global_symbols() const 1362 { 1363 gold_unreachable(); 1364 } 1365 1366 // Class Plugin_finish. This task runs after all replacement files have 1367 // been added. For now, it's a placeholder for a possible plugin API 1368 // to allow the plugin to release most of its resources. The cleanup 1369 // handlers must be called later, because they can remove the temporary 1370 // object files that are needed until the end of the link. 1371 1372 class Plugin_finish : public Task 1373 { 1374 public: 1375 Plugin_finish(Task_token* this_blocker, Task_token* next_blocker) 1376 : this_blocker_(this_blocker), next_blocker_(next_blocker) 1377 { } 1378 1379 ~Plugin_finish() 1380 { 1381 if (this->this_blocker_ != NULL) 1382 delete this->this_blocker_; 1383 } 1384 1385 Task_token* 1386 is_runnable() 1387 { 1388 if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked()) 1389 return this->this_blocker_; 1390 return NULL; 1391 } 1392 1393 void 1394 locks(Task_locker* tl) 1395 { tl->add(this, this->next_blocker_); } 1396 1397 void 1398 run(Workqueue*) 1399 { 1400 // We could call early cleanup handlers here. 1401 } 1402 1403 std::string 1404 get_name() const 1405 { return "Plugin_finish"; } 1406 1407 private: 1408 Task_token* this_blocker_; 1409 Task_token* next_blocker_; 1410 }; 1411 1412 // Class Plugin_hook. 1413 1414 Plugin_hook::~Plugin_hook() 1415 { 1416 } 1417 1418 // Return whether a Plugin_hook task is runnable. 1419 1420 Task_token* 1421 Plugin_hook::is_runnable() 1422 { 1423 if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked()) 1424 return this->this_blocker_; 1425 return NULL; 1426 } 1427 1428 // Return a Task_locker for a Plugin_hook task. We don't need any 1429 // locks here. 1430 1431 void 1432 Plugin_hook::locks(Task_locker*) 1433 { 1434 } 1435 1436 // Run the "all symbols read" plugin hook. 1437 1438 void 1439 Plugin_hook::run(Workqueue* workqueue) 1440 { 1441 gold_assert(this->options_.has_plugins()); 1442 Symbol* start_sym = this->symtab_->lookup(parameters->entry()); 1443 if (start_sym != NULL) 1444 start_sym->set_in_real_elf(); 1445 1446 this->options_.plugins()->all_symbols_read(workqueue, 1447 this, 1448 this->input_objects_, 1449 this->symtab_, 1450 this->dirpath_, 1451 this->mapfile_, 1452 &this->this_blocker_); 1453 workqueue->queue_soon(new Plugin_finish(this->this_blocker_, 1454 this->next_blocker_)); 1455 } 1456 1457 // The C interface routines called by the plugins. 1458 1459 #ifdef ENABLE_PLUGINS 1460 1461 // Register a claim-file handler. 1462 1463 static enum ld_plugin_status 1464 register_claim_file(ld_plugin_claim_file_handler handler) 1465 { 1466 gold_assert(parameters->options().has_plugins()); 1467 parameters->options().plugins()->set_claim_file_handler(handler); 1468 return LDPS_OK; 1469 } 1470 1471 // Register an all-symbols-read handler. 1472 1473 static enum ld_plugin_status 1474 register_all_symbols_read(ld_plugin_all_symbols_read_handler handler) 1475 { 1476 gold_assert(parameters->options().has_plugins()); 1477 parameters->options().plugins()->set_all_symbols_read_handler(handler); 1478 return LDPS_OK; 1479 } 1480 1481 // Register a cleanup handler. 1482 1483 static enum ld_plugin_status 1484 register_cleanup(ld_plugin_cleanup_handler handler) 1485 { 1486 gold_assert(parameters->options().has_plugins()); 1487 parameters->options().plugins()->set_cleanup_handler(handler); 1488 return LDPS_OK; 1489 } 1490 1491 // Add symbols from a plugin-claimed input file. 1492 1493 static enum ld_plugin_status 1494 add_symbols(void* handle, int nsyms, const ld_plugin_symbol* syms) 1495 { 1496 gold_assert(parameters->options().has_plugins()); 1497 Pluginobj* obj = parameters->options().plugins()->make_plugin_object( 1498 static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle))); 1499 if (obj == NULL) 1500 return LDPS_ERR; 1501 obj->store_incoming_symbols(nsyms, syms); 1502 return LDPS_OK; 1503 } 1504 1505 // Get the input file information with an open (possibly re-opened) 1506 // file descriptor. 1507 1508 static enum ld_plugin_status 1509 get_input_file(const void* handle, struct ld_plugin_input_file* file) 1510 { 1511 gold_assert(parameters->options().has_plugins()); 1512 unsigned int obj_index = 1513 static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle)); 1514 return parameters->options().plugins()->get_input_file(obj_index, file); 1515 } 1516 1517 // Release the input file. 1518 1519 static enum ld_plugin_status 1520 release_input_file(const void* handle) 1521 { 1522 gold_assert(parameters->options().has_plugins()); 1523 unsigned int obj_index = 1524 static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle)); 1525 return parameters->options().plugins()->release_input_file(obj_index); 1526 } 1527 1528 static enum ld_plugin_status 1529 get_view(const void *handle, const void **viewp) 1530 { 1531 gold_assert(parameters->options().has_plugins()); 1532 unsigned int obj_index = 1533 static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle)); 1534 return parameters->options().plugins()->get_view(obj_index, viewp); 1535 } 1536 1537 // Get the symbol resolution info for a plugin-claimed input file. 1538 1539 static enum ld_plugin_status 1540 get_symbols(const void* handle, int nsyms, ld_plugin_symbol* syms) 1541 { 1542 gold_assert(parameters->options().has_plugins()); 1543 Plugin_manager* plugins = parameters->options().plugins(); 1544 Object* obj = plugins->object( 1545 static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle))); 1546 if (obj == NULL) 1547 return LDPS_ERR; 1548 Pluginobj* plugin_obj = obj->pluginobj(); 1549 if (plugin_obj == NULL) 1550 return LDPS_ERR; 1551 Symbol_table* symtab = plugins->symtab(); 1552 return plugin_obj->get_symbol_resolution_info(symtab, nsyms, syms, 1); 1553 } 1554 1555 // Version 2 of the above. The only difference is that this version 1556 // is allowed to return the resolution code LDPR_PREVAILING_DEF_IRONLY_EXP. 1557 1558 static enum ld_plugin_status 1559 get_symbols_v2(const void* handle, int nsyms, ld_plugin_symbol* syms) 1560 { 1561 gold_assert(parameters->options().has_plugins()); 1562 Plugin_manager* plugins = parameters->options().plugins(); 1563 Object* obj = plugins->object( 1564 static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle))); 1565 if (obj == NULL) 1566 return LDPS_ERR; 1567 Pluginobj* plugin_obj = obj->pluginobj(); 1568 if (plugin_obj == NULL) 1569 return LDPS_ERR; 1570 Symbol_table* symtab = plugins->symtab(); 1571 return plugin_obj->get_symbol_resolution_info(symtab, nsyms, syms, 2); 1572 } 1573 1574 // Version 3 of the above. The only difference from v2 is that it 1575 // returns LDPS_NO_SYMS instead of LDPS_OK for the objects we never 1576 // decided to include. 1577 1578 static enum ld_plugin_status 1579 get_symbols_v3(const void* handle, int nsyms, ld_plugin_symbol* syms) 1580 { 1581 gold_assert(parameters->options().has_plugins()); 1582 Plugin_manager* plugins = parameters->options().plugins(); 1583 Object* obj = plugins->object( 1584 static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle))); 1585 if (obj == NULL) 1586 return LDPS_ERR; 1587 Pluginobj* plugin_obj = obj->pluginobj(); 1588 if (plugin_obj == NULL) 1589 return LDPS_ERR; 1590 Symbol_table* symtab = plugins->symtab(); 1591 return plugin_obj->get_symbol_resolution_info(symtab, nsyms, syms, 3); 1592 } 1593 1594 // Add a new (real) input file generated by a plugin. 1595 1596 static enum ld_plugin_status 1597 add_input_file(const char* pathname) 1598 { 1599 gold_assert(parameters->options().has_plugins()); 1600 return parameters->options().plugins()->add_input_file(pathname, false); 1601 } 1602 1603 // Add a new (real) library required by a plugin. 1604 1605 static enum ld_plugin_status 1606 add_input_library(const char* pathname) 1607 { 1608 gold_assert(parameters->options().has_plugins()); 1609 return parameters->options().plugins()->add_input_file(pathname, true); 1610 } 1611 1612 // Set the extra library path to be used by libraries added via 1613 // add_input_library 1614 1615 static enum ld_plugin_status 1616 set_extra_library_path(const char* path) 1617 { 1618 gold_assert(parameters->options().has_plugins()); 1619 return parameters->options().plugins()->set_extra_library_path(path); 1620 } 1621 1622 // Issue a diagnostic message from a plugin. 1623 1624 static enum ld_plugin_status 1625 message(int level, const char* format, ...) 1626 { 1627 va_list args; 1628 va_start(args, format); 1629 1630 switch (level) 1631 { 1632 case LDPL_INFO: 1633 parameters->errors()->info(format, args); 1634 break; 1635 case LDPL_WARNING: 1636 parameters->errors()->warning(format, args); 1637 break; 1638 case LDPL_ERROR: 1639 default: 1640 parameters->errors()->error(format, args); 1641 break; 1642 case LDPL_FATAL: 1643 parameters->errors()->fatal(format, args); 1644 break; 1645 } 1646 1647 va_end(args); 1648 return LDPS_OK; 1649 } 1650 1651 // Get the section count of the object corresponding to the handle. This 1652 // plugin interface can only be called in the claim_file handler of the plugin. 1653 1654 static enum ld_plugin_status 1655 get_input_section_count(const void* handle, unsigned int* count) 1656 { 1657 gold_assert(parameters->options().has_plugins()); 1658 1659 if (!parameters->options().plugins()->in_claim_file_handler()) 1660 return LDPS_ERR; 1661 1662 Object* obj = parameters->options().plugins()->get_elf_object(handle); 1663 1664 if (obj == NULL) 1665 return LDPS_ERR; 1666 1667 *count = obj->shnum(); 1668 return LDPS_OK; 1669 } 1670 1671 // Get the type of the specified section in the object corresponding 1672 // to the handle. This plugin interface can only be called in the 1673 // claim_file handler of the plugin. 1674 1675 static enum ld_plugin_status 1676 get_input_section_type(const struct ld_plugin_section section, 1677 unsigned int* type) 1678 { 1679 gold_assert(parameters->options().has_plugins()); 1680 1681 if (!parameters->options().plugins()->in_claim_file_handler()) 1682 return LDPS_ERR; 1683 1684 Object* obj 1685 = parameters->options().plugins()->get_elf_object(section.handle); 1686 1687 if (obj == NULL) 1688 return LDPS_BAD_HANDLE; 1689 1690 *type = obj->section_type(section.shndx); 1691 return LDPS_OK; 1692 } 1693 1694 // Get the name of the specified section in the object corresponding 1695 // to the handle. This plugin interface can only be called in the 1696 // claim_file handler of the plugin. 1697 1698 static enum ld_plugin_status 1699 get_input_section_name(const struct ld_plugin_section section, 1700 char** section_name_ptr) 1701 { 1702 gold_assert(parameters->options().has_plugins()); 1703 1704 if (!parameters->options().plugins()->in_claim_file_handler()) 1705 return LDPS_ERR; 1706 1707 Object* obj 1708 = parameters->options().plugins()->get_elf_object(section.handle); 1709 1710 if (obj == NULL) 1711 return LDPS_BAD_HANDLE; 1712 1713 // Check if the object is locked before getting the section name. 1714 gold_assert(obj->is_locked()); 1715 1716 const std::string section_name = obj->section_name(section.shndx); 1717 *section_name_ptr = static_cast<char*>(malloc(section_name.length() + 1)); 1718 memcpy(*section_name_ptr, section_name.c_str(), section_name.length() + 1); 1719 return LDPS_OK; 1720 } 1721 1722 // Get the contents of the specified section in the object corresponding 1723 // to the handle. This plugin interface can only be called in the 1724 // claim_file handler of the plugin. 1725 1726 static enum ld_plugin_status 1727 get_input_section_contents(const struct ld_plugin_section section, 1728 const unsigned char** section_contents_ptr, 1729 size_t* len) 1730 { 1731 gold_assert(parameters->options().has_plugins()); 1732 1733 if (!parameters->options().plugins()->in_claim_file_handler()) 1734 return LDPS_ERR; 1735 1736 Object* obj 1737 = parameters->options().plugins()->get_elf_object(section.handle); 1738 1739 if (obj == NULL) 1740 return LDPS_BAD_HANDLE; 1741 1742 // Check if the object is locked before getting the section contents. 1743 gold_assert(obj->is_locked()); 1744 1745 section_size_type plen; 1746 *section_contents_ptr 1747 = obj->section_contents(section.shndx, &plen, false); 1748 *len = plen; 1749 return LDPS_OK; 1750 } 1751 1752 // Get the alignment of the specified section in the object corresponding 1753 // to the handle. This plugin interface can only be called in the 1754 // claim_file handler of the plugin. 1755 1756 static enum ld_plugin_status 1757 get_input_section_alignment(const struct ld_plugin_section section, 1758 unsigned int* addralign) 1759 { 1760 gold_assert(parameters->options().has_plugins()); 1761 1762 if (!parameters->options().plugins()->in_claim_file_handler()) 1763 return LDPS_ERR; 1764 1765 Object* obj 1766 = parameters->options().plugins()->get_elf_object(section.handle); 1767 1768 if (obj == NULL) 1769 return LDPS_BAD_HANDLE; 1770 1771 *addralign = obj->section_addralign(section.shndx); 1772 return LDPS_OK; 1773 } 1774 1775 // Get the size of the specified section in the object corresponding 1776 // to the handle. This plugin interface can only be called in the 1777 // claim_file handler of the plugin. 1778 1779 static enum ld_plugin_status 1780 get_input_section_size(const struct ld_plugin_section section, 1781 uint64_t* secsize) 1782 { 1783 gold_assert(parameters->options().has_plugins()); 1784 1785 if (!parameters->options().plugins()->in_claim_file_handler()) 1786 return LDPS_ERR; 1787 1788 Object* obj 1789 = parameters->options().plugins()->get_elf_object(section.handle); 1790 1791 if (obj == NULL) 1792 return LDPS_BAD_HANDLE; 1793 1794 *secsize = obj->section_size(section.shndx); 1795 return LDPS_OK; 1796 } 1797 1798 1799 // Specify the ordering of sections in the final layout. The sections are 1800 // specified as (handle,shndx) pairs in the two arrays in the order in 1801 // which they should appear in the final layout. 1802 1803 static enum ld_plugin_status 1804 update_section_order(const struct ld_plugin_section* section_list, 1805 unsigned int num_sections) 1806 { 1807 gold_assert(parameters->options().has_plugins()); 1808 1809 if (num_sections == 0) 1810 return LDPS_OK; 1811 1812 if (section_list == NULL) 1813 return LDPS_ERR; 1814 1815 Layout* layout = parameters->options().plugins()->layout(); 1816 gold_assert (layout != NULL); 1817 1818 std::map<Section_id, unsigned int>* order_map 1819 = layout->get_section_order_map(); 1820 1821 /* Store the mapping from Section_id to section position in layout's 1822 order_map to consult after output sections are added. */ 1823 for (unsigned int i = 0; i < num_sections; ++i) 1824 { 1825 Object* obj = parameters->options().plugins()->get_elf_object( 1826 section_list[i].handle); 1827 if (obj == NULL || obj->is_dynamic()) 1828 return LDPS_BAD_HANDLE; 1829 unsigned int shndx = section_list[i].shndx; 1830 Section_id secn_id(static_cast<Relobj*>(obj), shndx); 1831 (*order_map)[secn_id] = i + 1; 1832 } 1833 1834 return LDPS_OK; 1835 } 1836 1837 // Let the linker know that the sections could be reordered. 1838 1839 static enum ld_plugin_status 1840 allow_section_ordering() 1841 { 1842 gold_assert(parameters->options().has_plugins()); 1843 Layout* layout = parameters->options().plugins()->layout(); 1844 layout->set_section_ordering_specified(); 1845 return LDPS_OK; 1846 } 1847 1848 // Let the linker know that a subset of sections could be mapped 1849 // to a unique segment. 1850 1851 static enum ld_plugin_status 1852 allow_unique_segment_for_sections() 1853 { 1854 gold_assert(parameters->options().has_plugins()); 1855 Layout* layout = parameters->options().plugins()->layout(); 1856 layout->set_unique_segment_for_sections_specified(); 1857 return LDPS_OK; 1858 } 1859 1860 // This function should map the list of sections specified in the 1861 // SECTION_LIST to a unique segment. ELF segments do not have names 1862 // and the NAME is used to identify Output Section which should contain 1863 // the list of sections. This Output Section will then be mapped to 1864 // a unique segment. FLAGS is used to specify if any additional segment 1865 // flags need to be set. For instance, a specific segment flag can be 1866 // set to identify this segment. Unsetting segment flags is not possible. 1867 // ALIGN specifies the alignment of the segment. 1868 1869 static enum ld_plugin_status 1870 unique_segment_for_sections(const char* segment_name, 1871 uint64_t flags, 1872 uint64_t align, 1873 const struct ld_plugin_section* section_list, 1874 unsigned int num_sections) 1875 { 1876 gold_assert(parameters->options().has_plugins()); 1877 1878 if (num_sections == 0) 1879 return LDPS_OK; 1880 1881 if (section_list == NULL) 1882 return LDPS_ERR; 1883 1884 Layout* layout = parameters->options().plugins()->layout(); 1885 gold_assert (layout != NULL); 1886 1887 Layout::Unique_segment_info* s = new Layout::Unique_segment_info; 1888 s->name = segment_name; 1889 s->flags = flags; 1890 s->align = align; 1891 1892 for (unsigned int i = 0; i < num_sections; ++i) 1893 { 1894 Object* obj = parameters->options().plugins()->get_elf_object( 1895 section_list[i].handle); 1896 if (obj == NULL || obj->is_dynamic()) 1897 return LDPS_BAD_HANDLE; 1898 unsigned int shndx = section_list[i].shndx; 1899 Const_section_id secn_id(static_cast<Relobj*>(obj), shndx); 1900 layout->insert_section_segment_map(secn_id, s); 1901 } 1902 1903 return LDPS_OK; 1904 } 1905 1906 #endif // ENABLE_PLUGINS 1907 1908 // Allocate a Pluginobj object of the appropriate size and endianness. 1909 1910 static Pluginobj* 1911 make_sized_plugin_object(Input_file* input_file, off_t offset, off_t filesize) 1912 { 1913 Pluginobj* obj = NULL; 1914 1915 parameters_force_valid_target(); 1916 const Target& target(parameters->target()); 1917 1918 if (target.get_size() == 32) 1919 { 1920 if (target.is_big_endian()) 1921 #ifdef HAVE_TARGET_32_BIG 1922 obj = new Sized_pluginobj<32, true>(input_file->filename(), 1923 input_file, offset, filesize); 1924 #else 1925 gold_error(_("%s: not configured to support " 1926 "32-bit big-endian object"), 1927 input_file->filename().c_str()); 1928 #endif 1929 else 1930 #ifdef HAVE_TARGET_32_LITTLE 1931 obj = new Sized_pluginobj<32, false>(input_file->filename(), 1932 input_file, offset, filesize); 1933 #else 1934 gold_error(_("%s: not configured to support " 1935 "32-bit little-endian object"), 1936 input_file->filename().c_str()); 1937 #endif 1938 } 1939 else if (target.get_size() == 64) 1940 { 1941 if (target.is_big_endian()) 1942 #ifdef HAVE_TARGET_64_BIG 1943 obj = new Sized_pluginobj<64, true>(input_file->filename(), 1944 input_file, offset, filesize); 1945 #else 1946 gold_error(_("%s: not configured to support " 1947 "64-bit big-endian object"), 1948 input_file->filename().c_str()); 1949 #endif 1950 else 1951 #ifdef HAVE_TARGET_64_LITTLE 1952 obj = new Sized_pluginobj<64, false>(input_file->filename(), 1953 input_file, offset, filesize); 1954 #else 1955 gold_error(_("%s: not configured to support " 1956 "64-bit little-endian object"), 1957 input_file->filename().c_str()); 1958 #endif 1959 } 1960 1961 gold_assert(obj != NULL); 1962 return obj; 1963 } 1964 1965 } // End namespace gold. 1966